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Expanding an Array

UPC - 093053789114

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StorView RAID Module 3 Scroll down and choose the specific array that became critical from the removed/failed drive. 4 A confirmation window will appear indicating the successful execution of the command, click the CLOSE button. 5 Important Click the CLOSE button on the Drive Information window. For a RAID 6 rebuild operations, if two (2) drives fail, and a rebuild is started after replacing both disk drives, only one drive rebuild is performed at a time. This means one drive will be rebuilt then the second drive rebuild will be started. You can monitor the rebuild operation from the Main screen 10.2.6 Expanding an Array Caution You must stop all host I/O operations prior to deleting an array. Important RAID 6 disk arrays do not support array expansion. Note The Expand Array feature is used to increase the capacity of an existing array. An array can be expanded to a maximum of 16 drives. Only one array can be expanded at a time. No configuration changes can be made to the arrays, logical drives, or SAN LUN Mapping while an expansion operation is in progress. During the expansion process, data is re-striped across a new set of data drives, and new parity is calculated and written if necessary for fault tolerant arrays. If the array is a fault tolerant array, such as RAID level 1, 10, 5, or 50, it will remain fault tolerant during the expansion. Should a disk drive fail in a fault tolerant array during the expansion, the expand operation will continue as normal at which time it will flag the drive as failed and use the data and parity information to create the new data and parity stripe. After the expansion is complete, and if you had a hot spare designated, the automatic rebuild operation will commence bringing the non-fault tolerant expanded array back to a fault tolerant condition. Note If a second drive failure occurs during expansion, that condition is not recoverable and you will have a total loss of data. You may wish to consider backing up the data prior to expanding an array. Although there is a level of protection during this operation without the backup, the best insurance is a valid backup. After the array expansion process has completed, if you are expanding for the purposes of new drive space you will need to create the appropriate logical drive(s) and define them in your operating system. However, if the expansion is intended to increase the existing logical drive capacity you will need to perform a LUN Expansion. Afterwards a third-party volume/partition software product will be necessary to manipulate any existing partitions. 1 Stop all host I/O operations. 2 On the Main screen locate and click on the you wish to expand. This will open the Array Information window. 3 From the Array Information window, click the Expand Array tab, see Figure 10-10 "Expand Array Tab Selected" beginning on page 107. 106

Section	Page
Introduction	9
1.1 Overview	9
1.2 Inter-Server Communication	9
1.2.1 Multicast	9
1.3 License Manager	10
1.3.1 Access License Limits	10
1.3.2 Feature License	11
StorView Quick Tour	13
2.1 The Work Area	13
2.1.1 Tool Bar	14
2.1.2 Enclosure Section	15
2.1.3 Array and Logical Drive Section	23
2.1.4 Server Sidebar and Top Section	25
2.2 How to Use this Document	27
Embedded StorView Setup	29
3.1 Embedded Network Settings	29
3.1.1 Configuring Network Settings via the Wizard	29
3.1.2 Configuring Network Settings via the CLI	32
3.1.3 Configuring Network Settings within StorView	32
3.1.4 Getting a New IP Address	33
Getting Started	35
4.1 Starting StorView	35
4.2 Upgrading the Access License	35
4.3 E-MAIL	37
4.3.1 Configuring E-Mail Notices	37
4.3.2 Deleting an E-Mail Addressee	38
4.4 SNMP	39
4.4.1 Configuring SNMP Traps	39
4.4.2 Deleting an SNMP Server	40
4.5 SYSLOG	41
4.5.1 Gathering Logs	41
4.5.2 SYSLOG Daemon	41
4.5.3 Operational View	42
4.5.4 Configuring SYSLOG	42
4.5.5 Delete a SYSLOG Server	43
4.6 Changing the Password	44
4.7 Monitoring Settings	45
4.7.1 Additional Monitoring Servers	46
4.7.2 Remove Monitored StorView Server IP	46
Storage Assistant	47
5.1 Assisted Automatic Configuration	47
Configuring a Storage Solution	53
6.1 Creating Disk Arrays	53
6.1.1 RAID Levels	53
6.1.2 Terminology	54
6.1.3 Optimization and Drive Selection for RAID 5 and 6	56
6.2 Create the Array	56
6.2.1 Configuring Array Writeback Cache	62
6.3 Initializing the Array	63
6.3.1 Pause/Resume the Initialization	64
6.4 Adding Hot Spare Drives	65
6.4.1 Assigning a Global Spare	65
6.4.2 Assigning a Dedicated Spare	66
6.4.3 Removing a Spare	68
6.4.4 Auto Spare	69
6.5 Create the Logical Drive	70
6.6 Saving the Configuration	73
6.6.1 Saving the Configuration	73
SAN LUN Mapping	77
7.1 Overview	77
7.2 Terminology	77
7.3 Accessing SAN LUN Mapping	78
7.4 Overview: SAN LUN Mapping Window	80
7.4.1 HBA Ports Name Section	80
7.4.2 ADD NEW MAP Section	81
7.4.3 SELECTED HOST HBA PORT CONNECTION Section	81
7.5 Creating a SAN LUN Mapping	82
7.6 Deleting a SAN LUN Mapping	85
7.7 Modifying a SAN LUN Mapping	86
Controller Environmentals	89
8.1 Overview	89
8.2 Controller Environmentals	89
8.2.1 Status	91
8.2.2 Hardware/Firmware	91
8.2.3 Configuration	91
8.2.4 Operations	91
Controller Advanced Settings	99
9.1 Overview	99
9.2 Advanced Settings	99
9.2.1 Identity	100
9.2.2 Fault Tolerance	102
9.2.3 Host Ports	104
Managing the Storage Solution	107
10.1 Overview	107
10.2 Advanced Array Functions	108
10.2.1 Deleting an Array	108
10.2.2 Modifying Arrays	109
10.2.3 Verify Parity	109
10.2.4 Identifying Drive Members	112
10.2.5 Rebuilding an Array	113
10.2.6 Expanding an Array	114
10.2.7 Trust an Array	116
10.3 Restoring and Clearing the Configuration	117
10.3.1 Restoring the Configuration	117
10.3.2 Clearing the Configuration	118
10.4 Advanced Drive Options	121
10.4.1 Accessing the Drive Information Window	121
10.4.2 Locate Drive	122
10.5 Advanced Logical Drive Functions	123
10.5.1 Viewing Unassigned Free Space	123
10.5.2 Expanding a Logical Drive	123
10.5.3 Deleting a Logical Drive	125
Using Snapshot	127
11.1 Introduction	127
11.2 Enabling Snapshot	127
11.3 Taking a Snapshot	130
11.4 Mapping a Snapshot	133
11.5 Deleting a Snapshot	135
11.6 Performing a Snapback	137
11.7 Disabling Snapshot	139
Failover, Performance and Additional Functions	141
12.1 Overview	141
12.2 How StorView Server Failover Works	141
12.3 StorView Performance Optimization	142
12.3.1 Execution Throttle	142
12.3.2 Scatter/Gather	142
12.4 Time Out Issues	142
12.5 Additional StorView Functions	143
12.5.1 About	143
12.5.2 Take Control Monitoring	144
12.5.3 Rescan	145
12.5.4 Alarm Mute and Enable/Disable	146
Support and Updates	147
13.1 Tech Support	147
13.2 Updating Embedded StorView	149
Event Logs	151
14.1 Overview	151
14.2 Accessing and Navigating the StorView Event Log	153
14.3 Exporting the StorView Event Log	154
14.4 Clearing the StorView Event Log	157
14.5 Operating System Event Log	158
14.6 List of Events	159
14.6.1 Controller Events	159
14.6.2 Expansion Module Events	165
14.6.3 Alarm Events	166
14.6.4 Drive and Array Events	167
14.6.5 Controller Port Events	172
14.6.6 Enclosure Events	174
14.6.7 StorView Server Events	177
14.6.8 SnapShot Events	181
14.7 Failed Drives Codes	183
14.8 SAS Fatal Error Codes	183
Statistics	185
15.1 Overview	185
15.2 Access Statistics	186
15.3 Command Size - Alignment Statistics	187
15.4 Read-Ahead Statistics	189
15.5 Command Cluster Statistics	191
A.1 Introduction	193
A.2 Sequential Access	194
A.2.1 Number of Outstanding Commands	194
A.3 Access Size	194
A.3.1 Access Alignment	194
A.4 Sub-Array	195
A.5 Multiple Drive Failures	196
A.5.1 Faster Rebuild	196
A.6 Summary	196
B.1 Problems You May Encounter	197
C.1 Overview	203
C.1.1 Terminology	203
C.2 Overwrite Data Area	204
C.3 Overwrite Data Area Location	205
C.4 Selecting the ODA Stripe Size	205
C.5 Overwrite Data Area Storage Capacity	205
C.6 ODA Assignment	206
C.7 Snapshots and Caching	206
C.7.1 Application Caches	206
C.7.2 Operating System Cache	207
C.7.3 RAID Controller Cache	207
C.8 Virtual LUNs	207

Match case Limit results 1 per page

StorView RAID Module

106

Scroll down and choose the specific array that became critical from the removed/failed drive.

A confirmation window will appear indicating the successful execution of the command, click the

button.

Click the

button on the Drive Information window.

Important

For a RAID 6 rebuild operations, if two (2) drives fail, and a rebuild is started after replacing both

disk drives, only one drive rebuild is performed at a time. This means one drive will be rebuilt then

the second drive rebuild will be started.

You can monitor the rebuild operation from the Main screen

10.2.6

Expanding an Array

Caution

You must stop all host I/O operations prior to deleting an array.

Important

RAID 6 disk arrays do not support array expansion.

The Expand Array feature is used to increase the capacity of an existing array. An array can be expanded

to a maximum of 16 drives. Only one array can be expanded at a time.

Note

No configuration changes can be made to the arrays, logical drives, or SAN LUN Mapping while an

expansion operation is in progress.

During the expansion process, data is re-striped across a new set of data drives, and new parity is

calculated and written if necessary for fault tolerant arrays. If the array is a fault tolerant array, such as

RAID level 1, 10, 5, or 50, it will remain fault tolerant during the expansion.

Should a disk drive fail in a fault tolerant array during the expansion, the expand operation will continue

as normal at which time it will flag the drive as failed and use the data and parity information to create the

new data and parity stripe. After the expansion is complete, and if you had a hot spare designated, the

automatic rebuild operation will commence bringing the non-fault tolerant expanded array back to a fault

tolerant condition.

If a second drive failure occurs during expansion, that condition is not recoverable and you will have a

total loss of data. You may wish to consider backing up the data prior to expanding an array. Although

there is a level of protection during this operation without the backup, the best insurance is a valid backup.

Note

After the array expansion process has completed, if you are expanding for the purposes of new drive

space you will need to create the appropriate logical drive(s) and define them in your operating system.

However, if the expansion is intended to increase the existing logical drive capacity you will need to

perform a LUN Expansion. Afterwards a third-party volume/partition software product will be necessary

to manipulate any existing partitions.

Stop all host I/O operations.

On the Main screen locate and click on the

<Array_Name>

you wish to expand. This will open the Array

Information window.

From the Array Information window, click the

Expand Array

tab,

see Figure 10–10 ”Expand Array Tab

Selected” beginning on page 107.